308 LOWER PARTS KITS No MIM here. Luth-AR produces only the best quality, American made parts for the AR platform. All of the parts included in our lower parts kits are investment cast or otherwise machined to Mil-Spec drawings, materials and heat treat. Springs are a combination of 17-4 SST and various Mil-Spec steel wire are used in all of our springs with certification. Luth-AR's .308 AR complete lower parts kit includes everything you need to fully assemble a stripped AR lower receiver. It includes a trigger, hammer, trigger guard, magazine catch, bolt catch, selector switch, and all necessary pins and springs. Made with high-quality materials for durability and longev Mfg: Luth-Ar